16.10.6.8 Support of Resource Sharing across multiple Broadcast MBS sessions in RAN Sharing Scenario

NGAP supports resource sharing efficient scheme for broadcast delivery in RAN sharing. Such scheme enables the gNB to identify broadcast MBS sessions from different PLMNs providing identical content. The identification is based on information provided by the involved 5GCs in the Associated Session ID as specified in TS 23.247 [45].

If in the MBS Broadcast Setup Request message an Associated Session ID is received from a 5GC participating in RAN sharing, the gNB uses it to determine whether MBS Session resources can be shared with a broadcast MBS session(s) associated with the same Associated Session ID requested from another 5GC participating in RAN sharing.

The identification of MBS Broadcast Sessions providing identical content may also be based on implementation specific configuration as specified in TS 23.247 [45].

The gNB applying this resource efficiency scheme:

• may decide whether NG-U resources are established towards all involved 5GCs or only some of them;
• resolves different QoS requirements or different S-NSSAIs received from the participating 5GCs in an implementation specific way.

The gNB may also trigger the NGAP Broadcast Session Transport procedure towards one 5GC participating in RAN sharing to set up NG-U resources to maintain NG-U connectivity as specified in TS 23.247 [45].